Collector's Cage

Hideaway has always carried a tension: the free spell is the payoff, but the unlock condition decides whether it ever fires. Most designs in this lineage hinged on a single dramatic threshold (a critical life total, a graveyard count) that either happened or did not. This one reworks the tripwire into something you build toward incrementally. The activated ability does two jobs at once: it drops a +1/+1 counter, and it checks a board state that the counter itself is quietly manipulating. You need three creatures with different powers, and because the counter modifies power on the way in, every activation is nudging the board toward the condition it wants to see. That is the clever knot: the fuel and the key are the same button. A wide board of same-size tokens is slow to unlock here, but three creatures at different sizes (a mana dork, a two-drop, something you have been growing) satisfies it easily, and each subsequent tick keeps the spread intact so long as you target carefully. The exiled card sits face down until then, so the reward is committed when it enters and revealed on your terms, which means the sequencing question is less "can I turn this on" and more "have I kept my creatures out of lockstep." It rewards a curve that spreads across power values rather than one that clumps, an unusual deckbuilding axis for a two-mana artifact that otherwise reads like a slow counter engine.